What you discribed is pranayama in Indian Yogic system. To live life free of deceses and conencted to god to live with peace and happpiness this is the way. What you discribed is only one way of complete yogic cycle.
there are much more than belly breathing which really helps you a lot to face life in every day happily and successfully .

Search in google for BABA RAMDEV yoga. He is a winderful hindu preacher follow his instrctions you see wonders in your life.